P02AF: Cylinder 6 - Fuel Trim at Min Limit

What it means

The control module has reached the minimum fuel-trim correction for cylinder 6. This indicates a cylinder-specific mixture correction limit; the code alone does not identify the underlying cause.

At a glance

• Usually lights the check-engine light
• Affects emissions; the car can fail an emissions test

How it works

The engine computer adjusts fuel for cylinder 6 to keep combustion balanced. This code sets when cylinder 6's fuel-trim correction reaches its lower calibrated limit, which may reflect excess fuel, an injector that does not close, or a faulty cylinder-specific input.

Common causes

Most likely first.

1. Injector leaking on cylinder 6
2. Injector stuck open or control fault
3. Excess fuel pressure
4. Cylinder 6 sensor or wiring fault

Symptoms

• Check-engine light
• Rough idle or engine vibration
• Misfire or hesitation
• Fuel odor or increased fuel consumption

How to diagnose it

1. Review freeze-frame data, cylinder-specific trim values, and misfire counts to see when cylinder 6 reaches the lower limit.
2. Check for fuel odor or visible leakage around cylinder 6's injector and seal.
3. Inspect cylinder 6 injector wiring and connector for damage, poor contact, or signs of a control fault.
4. Test cylinder 6 injector leakage and operation, comparing it with the other injectors.
5. Check fuel pressure and relevant cylinder-specific sensor and control signals against the manufacturer's specification.

Common fixes

• Replace a leaking cylinder 6 injector seal.
• Clean or replace a cylinder 6 injector that fails leakage or flow testing.
• Repair cylinder 6 injector wiring or control connection.
• Correct excessive fuel pressure if confirmed by testing.

Can I keep driving?

Limit driving if the engine runs rough, hesitates, or smells of fuel, and arrange diagnosis soon. Excess fuel can worsen misfires, dilute engine oil, and damage the catalytic converter.